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Diffuse Reflected-Light Illuminator

Publishing Venue

IBM

Related People

Goodman, DS: AUTHOR

Abstract

Diffuse illumination is highly desirable in many optical in- spection applications. Difuse light "flattens" images, reducing t shadows due to topography. It also reduces noise due to the glints of light reflected from granular materials (e.g., additive copper). There is not, however, a fully satisfactory diffuse illuminator. Fluorescent lamps provide the most diffuse illumina- tion that is easily obtainable, but they suffer from several drawbacks, the most important being their low power and the limited spectra.

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
72% of the total text.

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Diffuse Reflected-Light Illuminator

Diffuse illumination is highly desirable in many optical in- spection
applications. Difuse light "flattens" images, reducing t shadows due to
topography. It also reduces noise due to the glints of light reflected from granular
materials (e.g., additive copper). There is not, however, a fully satisfactory diffuse
illuminator. Fluorescent lamps provide the most diffuse illumina- tion that is easily
obtainable, but they suffer from several drawbacks, the most important being
their low power and the limited spectra.

This publication describes an inexpensive diffuse illuminator number with a
number of salutary features. This device makes use of a standard fiber ring
illuminator and two cylindrical reflector Fibers in ring illuminators are pointed
inward as shown in Fig. 1, in order to produce a uniform field of light at some
working distance. In the new illuminator, as shown in Fig. 2, a shiny cylinder
within the ring reflects the light from the fiber illuminator onto a diffusely reflecting
cylinder on the outside of the ring. The light is then reflected toward the object
from a wide range of angles. The range of illumination angles is determined by
the lengths of the cylinders and can be easily

(Image Omitted)

adjusted, as shown in Fig. 3. The two reflectors need not be of "optical quality";
simple aluminum cylinders, for example, with low tolerances are satisfactory. In
addition, the alignment of the assembly is not critical.